Hello everyone, I want to restrict the domain of a vector to return it to a smaller data set. For example, X between 2 and 7

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X = [ 1 2 3 4 5 6 7 8 9 10 ];

Accepted Answer

dpb
dpb on 10 Aug 2022
Perfect use for my utility function iswithin
>> x=1:10;
>> x=x(iswithin(x,2,7))
x =
2 3 4 5 6 7
>>
where iswithin is
function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
% [log] = iswithin(x,lo,hi)
% returns T for x between lo and hi values, inclusive
flg= (x>=lo) & (x<=hi);
end
It's just "syntactic sugar" remove the logical expression out of the main code for legibility, but it's extremely handy for shortening multiple range selections or the like or using it in arguments to other functions instead of building temporaries.
Copy to an m-file named "iswithin.m" and place wherever on your MATLABPATH you keep such handy little goodies where they're available for everybody. I create a "Utilities" subdirectory and insert in second in line in my MATLABPATH behind my current working directory.

More Answers (2)

Image Analyst
Image Analyst on 10 Aug 2022
Try this:
X = [ 1 2 3 4 5 6 7 8 9 10];
mask = X > 2 & X < 7; % Or X >=2 & X <= 7
X = X(mask)
X = 1×4
3 4 5 6

the cyclist
the cyclist on 10 Aug 2022
X = [ 1 2 3 4 5 6 7 8 9 10 ];
idxToKeep = (X>=2) & (X<=7);
Xkeep = X(idxToKeep)
Xkeep = 1×6
2 3 4 5 6 7
You can also do it all in one line, without the intermediate variable
Xkeep = X((X>=2)&(X<=7))
Xkeep = 1×6
2 3 4 5 6 7
or not define a new variable, if you don't need one
X = X((X>=2)&(X<=7))
X = 1×6
2 3 4 5 6 7

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